Magneto ignition device



1919 2 Sheets-Sheet' 1 /1 TTOH/VEY J. K. LEIBING MAGNETO IGNITION DEVICEFiled July 2l July 10, 1923.

July 10,1923. l 1,461,128

J. K. LEIBING MAGNETO IGNITION DEVICE Filed July 2l 1919 2 Sheets-Sheet2 .027 HMP. .D C.

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A NOR/vf y Pueaaa July v1o, 1923.

. UNiTEn STATES rosari: n.' LETnING. or NEWARK, NEW JERSEY, assrenon Tovarnrrnomj ELECTRICAL.

PATENT 'COMPANY, 0F NEWARK, NEW JERSEY.

MAGNET() IGNITION DEVICE.

To all 'whom tmay concern:

Be it known'that I, Josnrn K. LEIBING, a citizen "ofthe United States,residing at Newark, in. the county 4of Essex and State ofl 'New Jersey,vhave invented certain new and useful Improvements in a Magneto IgnitionDevice, of which the following is a specification. f

'This invention relates to ign1t1on apparatus in which the movableelement is moved so as to control or shift the `direction of the fiuxWithout continuous rotation of the movable element. In the preferred,form illustrated in the drawings attached hereto, the

movable element is oscillated or rocked to produce the ux: changes andthe generation of the nignition spark. It has been the common ra'cticeheretofore in ignition generators o this type,com

monly referred `toas oscillators, to maintain the'circuit breaker'controlling the ignition cil in a .closed position during both the setting :and working stroke up to the polnt where the circuit breakeropens to produce the maximum spark timed in relation to the firingstroke of the engine. As will be hereinafterpointed out by the diagramsand curves,` the movement of the movable elementk from. its normalstationary position tor-what .issometimesx referred to as the cocked orworking position, will generate a flow of current in theeoil windingwhich acts 4vto choke "back-the flux through the coil and then 'atthehigher speeds is not given sutil- -`cient time for the fluxto reverseand build up v'current `through the coil in the direction lto roduce aproper spark. Heretoore this i dilibulty has-been overcome to someextent by making the ignition machine large and providing it with a verypowerful magnetic field so the spark produced will still be great enoughto` tire an engine under ordinary "c'onditions, 1 y

It isithe object o'my invention to provide an. ignitioni generator-.gin-which this diiiiculty is;V overcome, that .isf to l say one; in whichthe flux/is so vcontrolledlaste produce avery hot yspar-kun'der-.fall"conditions of operation and atfthe." same time,resulting il!! a machlne nmchjsimpler, lighten-.and- 4less' expensivethan! those used"I heretofore; A -Qtherand further objects-will beapparent 1.'- toone skilledinthe art aftera study ofV the specificationtaken in connection with the annexed drawings, wherein- F igure 1illustrates diagrammatically the application of my invention to anignition generator of the inductor type.

Figure 2 is a view similar to Figure 1 but with the eration.

Figure 3 shows a circuit breaker and cam in dii'erent position from thatshown in Figures 1 and 2.

Figure 4 is a View similar to Figure 3 but with the parts in a differentposition.

Figure 5 is a perspective view of the circuit breaker used in connectionwith my invention.

Figure 6 is a view ofone portion of the cam shown in the previousfigures.

`Figure 7 is a view of another portion o the cam.

Figure 8 is a washer used to hold the two potions shown in Figures 6 and7 together an Figure 9 is a screw used for holding the cam in positionon the operating shaft.

Figure 10 is a resilient member connected between the cam portions shownin Figures 6 and 7.

Figure 11 is a copy of an oscillograph record taken from a given type ofan ignition generator under a certain condition.

Figure 12 is a similar record of the same ignition generator underanother condition, while Figure 13 shows another condition of operationof the same machine.

Figure 14 is the same machine operated in the same condition as shown inFigure 1, but having my invention applied thereto.

Figure 15 is the same machine with my.

invention applied thereto under another set of conditions, and

Figures 16 and 17 illustrate the same ma-v chine under still otherconditions.

Referring now to the details, wherein like- 'andV a high tension winding5. A spark gap 6 illustrating a plug in an engine cylinder is -connectedin circuit with the-high tension n oFFicE.

parts in a different position of op.

winding 5. The breaker box b7 for attachment to one end of the ignitiongenerator carries a stationary insulated block 8 carry- XllllllllllZilli!! ll lllllll! lng ah member 10 carries a contact 11 adapted tocooperate with contact 9: Member 10 1s preferably grounded asindicated'. Between the field poles 1 and 2 an inductor having lobes 12and 13 is adapted to operate. This type of inductor and its manner ofdistributing the ilux through the lield poles 1 and 2 and core 3 isillustrative of the well known Dixie ty e of ignition nerator and sinceit is well i lustrated and escribed in Patent No. 1,081,760, issuedDecember 16, 1913, to C. T. Mason, it will not be further describedherein except in connection with my arran ment of control of the fluxthrough the wor ing coil. Attached to one end of the operating shaft isa lever 1 4 which 1s held in a normal stationar posltion by sprmgs 15and 16, all in a wel known manner. The .lever 14 is adapted to beoperated b a movable memberl 17 driven by the engine. On the other endof the operating shaft is mounted a cam consisting of two portions, oneportion shown in Fi re 7 having a cam 1.8 with sleeve 19 loose y mountedon the shaft and held thereto by means of a. pin extending through theslot 20, one end of the pin is adapted to engage the eyelet 21of spring22, the opposite end 23 of the spring is ada ted to enter a hole 24 incam 18. The end o the operating shaft is reduced to receive a secondportion 25 of the cam shown in Figure 6. This cam portion has a shorthub 26 which extends within the opening 27 of the cam portion 18. Akeyway 28 adapted to receive akey which is used in conjunction with thewasher 29 and screw 3 0 to fasten cam portion 25 to the end of theoperating shaft. The cam portion 18 has a notch 31 f which is adapted tobe engaged by a metallic bumper 32 carried adjacent the fiber bumper 33on the breaker arm 10. The metallic bumper 32 is preferably of steel andhardened so as to reduce the wear thereon.

Coming now to the operation of my device and assuming the parts to be inthe normal or stationary position shown in Figure 1, it will be notedthat the circuit breaker points 9 and 11 are heldopen by both portions18 and 25 of the cam engaging the bumpers 32 and 33. As the movableelement is moved by the member 17 acting to the right aga-inst lever 14,it is seen that the rotor lobes 12 and 13 which in normal positiondirect the magnetic ilux through the coils 4 and 5 in the direction ofthe arrow shown in Figure 1, will produce a: rate of change in this fluxtending to set up-a eurrent in the primary winding4, but this isprevented since the circuit contacts 9' and 11 are held apart. Furthermovement of the lever 14 to the right carries the cam 25 to the position,shown in Figure 3 but the cam 18 acting on the bumper 32 still holds tship with poles 2 and 1 respectively; that is to say, t0 a position inwhich the ux is reversed through the Iprimary coil 4 as indicated inFigure 2. irectly after this llux reversal has taken place, the cam 18moves to a point where the bumper 32 dro into the notch 31 allowin thecircuit reaker contacts 9 and 11 to ose, but since the flux throu h theprimary coil has already built up, w ile the contacts 9 and 11 are o nto substantially its maximum value re y for the return or working imulse, little or no current is generated and ence no choking eiect isproduced during the setting interval. Continued movement of the member17 carries the lever 14 with the movable element to its full workingposition as shown in Figure 2 and as soon as the member 17 passes fromengagement with the lever 14, the lever 14 together with the movableelement is quickly restored to normal position due to the energy storedin the spring 15. At this time the cam portions 18 and 25 are in theposition shown in Fi re 2, but due to the engagement ofthe umper 32engaging the notch 31 of cam-18 this portion of the cam is held, fromrotation until the rotating element has reached the position ofgenerating a maximum spark at which time the cam 25 reaches the positionshown in Figure 4, wherein it engages the bumper 33 to open the contactsbreakin through the primary coil 4 w ich in turn acts on the secondary 5to produce a spark in the usual manner. As soon as the breaker arm 10has been moved to open the contacts, as just explained, sprin 22 acts toreturn the cam 25 to its norma position shown in Figure 1, ready for thenext cycle of operation. From what has been said it will be readilyunderstood that the choking action present in ignition generators. wherethe ordinary cam is used is eliminated and a hot spark is produced atvarious periods `of oscillation or movement of the movable element undervarious conditions of operation.

To illustrate more graphically the advantages of my invention, referencewill be had to the curves illustrated in Figures 11 to 17 inclusive.Each of these figures are reproductions of oscillograph records takenfrom the same machine but inaccordanoe with the notations marked on thecurvesassociated with the diierent figure numbers. In each of theillustrations thecurves marked T illustrate sections of a time interthecircuit lio val curve automaticallyplaoed on the record i ures 11, 12and 13, the operation of a certain ignition generator with an ordinarcam 1s depicted, While Figures 14 to 16 inclusive illustrate the sameignition generator with my invention applied thereto; that is, oneequipped with a cam as herelnbefore described. An ignition generatorequlpped with the regular cam would give no spark at vall in a testgauge in which the pressure Was 125 'pounds per square inch but the samegenerator When equipped with my improved cam gave sparks under thiscondition as illustrated in Figures 16 and 17. From these curves it Willbe clear how my invention has improved the sparking ability of thisarticular ignition generator.

W ile I have shown the application of my invention to one form ofignition generator, it shall be understood that it may be used withother forms of ignition generators,such as the so-called shuttle type.It Will be further apparent that numerous changes and alterations may bemade in the details for carrying out my invention and I therefore do notWish to be limited to the exact form shown and described herein. Sincethe primary coil controls the .functioning of the secondary coil, I havereferred to the primary as the coil for producing the spark andtherefore do not W1sh to be limited to a construction which includesboth primary and secondary coils as one coil onlv may be used and thisconnected to a Wipe spark contact in the engine.

Havingthus described my invention, what 1. In a device of the characterdescribed, a coil for producing a spark, means for energizing said coilincluding a magnetic field and a movable element aving a normalstationary position for directing magnetic fiux through said field andcoil, means for moving said movable element from said normal position toa Working position, means `for preventing said coil from interfering4with the movement of the magnetic flux during a considerable part of themovement of the movable element from normal to Working position, meansfor utilizing the magnetic flux put into operation as the movableelement reaches the Working position and means for completing from theWorking osition the Working stroke of said mova le member for thepurpose described.

2. In a device of the character described, a coil for producing a spark,means for energizing said coil including a magnetic field and a movableelement having a normal stationary position for directing magnetic fluxthrough said lield and coil, means for moving said movable element fromsaid normal osition to a working position, a circuit reaker forcontrolling the Working of said coil. a cam acting on said circuitbreaker to hold said coil Winding open to. prevent generation of currenttherein during the early portion of the movement of the movable ele.ment from normal to Working position, means for quickly completing theWorking stroke of the movable element and a cam for acting on thecircuit breaker' near the end of the working stroke for the purposedescribed.

3. In a device of the character described, a coil for producing a spark,means for energizing said coil including a magnetic field and a movableelement having a normal stationary position for directing magnetic fluxthrough said field and coil, means for moving said movable element fromsaid normal position to a Working position, a circuit breaker forcontrolling the Working of said coil, a two part cam, one part acting inconjunction With said circuit breaker to hold said coil Winding open toprevent generation of current therein during a considerable part of themovement of said movable member from normal Working position, the otherpart of said cam acting on the circuit breaker at the proper time toproduce a spark from said coil on the Working stroke of said movablemember and means for producing a quick Working stroke of the movablemember.

4. In a device of the character described, a coil for producing a spark,means for energizing said coil including a magnetic field and a movableelement having a normal stationary position for directing magnetic fluxthrough said field and coil, means for moving said movable element fromsaid normal position to a working position, a circuit breaker .having amovable member for controlling the Working of said coil, said movablemember having a two section bumper, a cam having one part acting on onesection of the bumper to hold the movable member of the circuit breakerin open position for a longer period than the other part of the camacting on the other section of the bumper, whereby maximum energy may bestored in said coil and discharged on the Working stroke of the movableelement by the action of the second mentioned part of the cam acting onthe second mentioned section of the bumper.

5. In an oscillating ignition generator having a sparking coil and arotatable element having a drive shaft for producing changes of i'luxthrough said coil, an interrupter in circuit with said coil, a cam foroperating the interrupter at the time when maximum energy is stored insaid coil by the rotating element in its working stroke, and anauxiliary cam acting on said interrupter to hold said coil circuit openduring the initial flux changes produced by the rotatable element inbeing moved to a position for its Working stroke.

ment havin a ive shaf t.ifoi.-- producing changes ofluxthrough saidcoil,an-interhaving; a sparkin. coil andi afrota'table elerupter incircuitfwith said coil",` two interrupte'r cams operated by theshaftofsaidrotatable element, one cam being 4fastened directly 'to saidshaft' and moving* in; synchronism therewith and actin terrupter'atthetime when maximum energy is stored in said .coil by said rotatable eement in its working stroke and means for re and acting onsaidinterrupter at the time y when maximum energy is stored in said coil bysaid rotatable element in its working stroke, means for retarding theinitial rotative movement of the other cam through a predeterminedanglewhereby said interrupte'r is held open until said rotatable elementhas moved a predetermined distance for the purpose described and meansfor restoring said second cam to normal osition during the workingstroke of sai' rotatable element.

8. The method of producing sparking current from a coil associated witha eld carrying magnetic flux and with means for shifting the directionof the flux through the coil, which consists in shifting the directionof the flux and during substantially all of said shift, acting on saidcoil to prevent any action of the coil on said flux, then again shiftingthe direction of said flux and again acting on said coil at the instantof the maximum rate of change of fluxto produce the sparking current.

9. The method of producing sparkin current from a coil associated with afiel carrying magnetic flux and with means for changing the amount of`flux through `the coil, which consists in producing an initial changeof flux through said coil and coincident therewith acting on said coilto allow said initial ilux change to take 'l'ae'e freely and withouteect on the coil, t en producing another change of the fluit throughsaid coil andutilizing in the coil the ma'or p ortion of said change offlux to pro uce the sparking current.

210. In combination with -a high tension'I magneto of the oscillating.type, 'of 'interon said' iii-- wherein a-current is created in themagneto rupter mechanism' .controlling `the circuiti ofthe primarywinding, said interrupter mech mism-'arranged to insure that'the circuitof the primary winding is open during themajonportion of themovementofthe rotor inf one direction, closed at the end 'of such such lastmovement, seriatim.

.11. An oscillating ignition equipment consisting in combination fwith amagneto comprisiiig a rotor, stator, and neratin windings, spring meansnorma ly holding the rotor in a certain position with respect to thestator, a trip device operably connected with the rotor arranged to been aged by an engine driven actuator, move against the tension of saidspring means and released, together with means arranged to insure thatthecircuit includin the generating winding is open before t e tripdevice is released as aforesaid and closed during the whole of therecoil of the rotor under the tension ofsaid spring means.

12. An ignition magneto of the type generating winding b the recoil othe magneto rotor under t e tension of spring means after the latter hasbeen cocked against the tension of the said spring means and released,in combination with means arranged to insure that the circuit of thegenerating winding is open before the rotor recoils under the tension ofits associated spring means as aforesaid and closed before t e recoilmovement begins.

13. A n ignition magneto of the type wherein the current used forignition purposes is created in the magneto generating 'winding by therecoil of the magneto rotor under the tension of spring means after thelatter has been cocked against the tension of the spring means andreleased, in combinat-ion with an interruptor in circuit with thegenerating winding, said interrupter maintaining the circuit `of thegenerating winding closed during thev whole of the recoil of the rotor,and means for operating the interrupter to maintain the circuit of thegeneratin `winding in open condition during the maJor portion of timeimmediately prior to the recoil of the rotor under the tension of saidspring means.

14. In combination with an ignition magneto of the oscillating type,means arranged to insure that the circuitincluding the vinagnetogenerating winding-is open during a substantial portion of time prior tothe re-v coil of the rotor and closed during the whole of the -recoil ofthe rotor.

y, ln witness whereof, I ax my sli-gnature.

@JOSEPH K. 'LEIBINQ

